# [rrd-users] Re: Manipulating and Graphing Data

Tony Varriale tvarriale at comcast.net
Tue Oct 31 22:10:41 MET 2006

```Ok...well...DERIVE doesn't give me accurate numbers.  Not even close.  That
is why I am trying to ask the community for a solution to the problem.

> GAUGE is _not_ a value, it is a rate.  And it is subject to
> any normalization and consolidation like any other rate.

Well...I'm really confused.  Here is what it's states from the beginner's
guide:

"GAUGE does not save the rate of change. It saves the actual value itself. "
Values       = 300, 600, 900, 1200
Step         = 300 seconds
COUNTER DS   =    1,  1,   1,    1
DERIVE DS    =    1,  1,   1,    1
ABSOLUTE DS  =    1,  2,   3,    4
GAUGE DS     = 300, 600, 900, 1200Could you clarify this?  So, has anyone
out there come up with a solution for this type of monitoring that could
provide me some clues?  Thanks!tv----- Original Message -----
From: "Alex van den Bogaerdt" <alex at ergens.op.het.net>
To: <rrd-users at list.ee.ethz.ch>
Sent: Tuesday, October 31, 2006 2:45 PM
Subject: [rrd-users] Re: Manipulating and Graphing Data

> On Tue, Oct 31, 2006 at 10:42:15AM -0600, Tony Varriale wrote:
>> > Closer, but it uses the values supplied AND THE TIME INTERVALS to
>> > work out the rate over each interval defined in your rrd. If your
>> > updates EXACTLY match the time intervals then the rate stored will
>> > match the value you put in, otherwise it will be adjusted.
>>
>> Right, which is why when I use GAUGE for this specific application, the
>> value is preserved.
>
> No, it is not.
>
> GAUGE is _not_ a value, it is a rate.  And it is subject to
> any normalization and consolidation like any other rate.
>
> It does not matter if you use COUNTER, DERIVE or GAUGE; the
> data is, always has been and probably will always be, a rate.
>
> If you want to know the difference between now and the previous,
> this is what DERIVE is for.
>
> --
> Alex van den Bogaerdt
> http://www.vandenbogaerdt.nl/rrdtool/
>
> --
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